As basic units of communication recognized by speakers themselves, communicative events have always been assumed to have clearly definable boundaries and characterizable joint activity for content. This, however, is not always the case. In this article, I argue for a communicative event I term ` prospecting an encounter' which typically occurs between shoppers and salespersons in Chinese local markets. `Prospecting' opens in a deliberately ambiguous way and ends when it either develops into a fully ratified encounter or dissolves into mere (...) unfocused interaction or even cessation of co-presence. The joint activity that occurs within its boundaries has an equivocal status as engagement. Close analysis of interactional data reveals how `prospecting' events are jointly accomplished by speakers through the strategic withholding of glances and the extensive use of silence. (shrink)